JP3459452B2 - Feeding control method for line terminating equipment and terminal equipment in ISDN - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply control system for a line terminating device and a terminal device connected to ISDN.

[0002]

2. Description of the Related Art FIG. 1 shows a conventional power supply system in ISDN.
Will be described. In this figure, a plurality of terminal devices 201, 202, ... Are connected to the line terminating device 1, and transmission / reception is performed. The maximum number of terminal devices connectable to the line terminating device 1 is eight in the basic interface. The terminal devices 201, 202, ... Have first power receiving units 251, 252, ..., respectively, and are supplied with power by the method described below. The power supply method includes phantom power supply (superimposed power supply) (hereinafter referred to as power supply A) in which four signal lines of pins (3) to (6) of the line termination device 1 are also used as power supply lines, and line termination. A method of supplying power to each terminal device 201, 202, ... Using a two-wire type dedicated wire pair of pins (7) and (8) of the device 1 (hereinafter referred to as power supply B), each terminal device. 201, 202, ...
For each commercial AC source, AC adapters 281, 282, ...
There is a local power supply that converts DC to power. The power supply A and the power supply B include normal power supply and limited power supply, respectively, and the power that can be supplied to the entire terminal device connected by the TTC standard JT-1430 is 1 W at maximum in normal power supply and is limited power supply in the power supply A. It is specified that the maximum power supply is 420 mW, the power supply B is 7 W or more for the normal power supply, and the power supply is 2 W or more for the limited power supply. However, one terminal consumes 380 mW of power. Further, in the ISDN commercial service in Japan, only limited power feeding by the power feeding A is performed, and normal power feeding by the power feeding A and power feeding by the power feeding B are not performed. The Q channel is a channel for transmitting additional layer 1 information from the terminal device 2 to the line terminating device 1, and is an FA for every 5 frames.
It is defined that there is one bit in the bit position.
This bit is currently undefined and unused for future feature additions and maintenance. Here, as the functions of the terminal devices 201, 202, ..., There are basic telephone functions (calling, receiving, calling), data functions, additional service (button telephone) functions, etc. It operates only by the limited power supply by the power supply A, but when the data function and the additional service function are required in addition to the basic telephone function, the limited power supply by the power supply A alone does not provide sufficient power. Implemented to operate these functions. Such a terminal device 2
In the case where local power supply is stopped, a method has been proposed in which only the operation of the basic telephone function is guaranteed by the limited power supply of the power supply A from the line terminating device 1 and the services such as the data function and the additional service function are stopped. It was

[0003]

However, in the above-mentioned conventional method, when the commercial AC power supply (local power supply) is stopped in the terminal device 2 for some reason, only the limited power supply by the power supply A from the line terminating device 1 is performed. Therefore, there is a problem that only the basic telephone function is guaranteed to operate, and services such as data function and additional service function cannot be provided. The present invention solves such a conventional problem, and when the commercial AC power supply (local power supply) of the terminal device is stopped for some reason, (the terminal device is linked to the deactivation of the power supply due to this) A backup power supply that supplies power temporarily secures the minimum control and monitoring functions of the terminal equipment, and this function requests power supply to the line termination equipment.) The power supply request from this terminal equipment causes the line termination equipment to operate. Therefore, instead of the limited power supply by the power supply A, the normal power supply by the power supply A or the power supply by the power supply B can be performed, and the terminal device is guaranteed to provide not only the basic telephone function but also the service such as the data function and the additional service function. It is a thing.

[0004]

According to the first aspect of the present invention, in order to achieve the above object, a first power feed for selectively outputting a normal power feed output or a limited power feed output to a terminal device by a phantom power feed method. Means and a second power supply means for selectively selecting and outputting a plurality of supply powers to the terminal device via a pair of power transmission lines, the ISDN line terminating device is provided with: A reception processing unit for detecting power supply request data supplied via a data line, and a power value to be supplied is calculated based on the power consumption value in the power supply request data, and the first power supply is performed. Means and a control means for controlling the selection state of the second power feeding means are respectively provided, and in the second invention, the first power receiving for inputting the normal power feeding output or the limited power feeding output from the line terminating device by the phantom power feeding method. Means and line termination In the terminal device of the ISDN provided with the second power receiving means for inputting the supply power selected from the device via the pair of power transmission lines, the third power receiving means for supplying the power based on the commercial power source, and A backup power supply that temporarily supplies power to the terminal in synchronization with the de-energization of the commercial power source, and a power supply request data that detects the de-energization of the commercial power source.
Is generated, the rise in the power supplied to the first power receiving means or the second power receiving means is detected, and the output power of the first power receiving means or the second power receiving means is supplied to the terminal device instead of the backup power source. And a control means for supplying each.

[0005]

When the local power supply to the terminal device is stopped, the backup power supply that temporarily supplies power to the terminal device in conjunction with the de-energization of the power supply causes the minimum control and monitoring functions of the terminal device. This function is used to make a power supply request to the line terminating device, and in accordance with the amount of power demanded from this terminal device, normal power supply by the power supply unit A instead of the limited power supply by the power supply A of the line terminating device or The power supply by the power supply unit B is appropriately selected to perform power supply according to the required power amount from the terminal device, and when it is confirmed that the terminal device has increased power, the output power of the power receiving unit is selected from the backup power supply. In addition to basic telephone functions, services such as data functions and additional service functions will be provided.

[0006]

Embodiments of the present invention will be specifically described with reference to the drawings. 2 and 3 are block diagrams of the line terminating device and the terminal device according to this embodiment, which correspond to one of the line terminating device 1 and the terminal devices 201 ... 202 in FIG. 1, respectively. is there. As shown in FIG. 2, the line terminating device 1 includes a central control unit 11, a line interface 12, a Q channel reception processing unit 13, and a power feeding control unit 1.
4 is composed of a power feeding unit A15 and a power feeding unit B16,
In the power feeding unit A, limited power feeding (0.42 W) and normal power feeding (1) by a four-wire phantom (superposed) power feeding
W) is possible, and in the power feeding section B, the limited power feeding (2W) and the normal power feeding (7) by the two-wire type dedicated line pair are possible.
W) is possible. Further, as shown in FIG. 3, the terminal device 2 includes a central control unit 21, a line interface 22, a Q channel transmission processing unit 23, a power reception monitoring unit 24, and a power reception unit A2.
5, a power receiving unit B26, a power receiving unit C27, and an AC adapter 28. The power receiving unit A includes the line terminating device 1 described above.
Power can be received from the power supply unit A, power reception unit B can also receive power from the power supply unit B, and power reception unit C can receive power from a commercial AC power supply via an AC adapter.
When the commercial AC power source is cut off, the central control unit 21, the Q-channel transmission processing unit 23, the power reception monitoring unit 24, and the like keep the minimum control and monitoring functions such as a battery so as to maintain them. It is backed up by a backup power supply. The terminal device 2 has a basic telephone function, a data function, an additional service function, and the like, and the operation of only the basic telephone function is guaranteed by the electric power obtained by the limited power supply of the power receiving unit A. When a function or an additional service function is required, the control power supply power of the power receiving unit A is insufficient, so local power supply is performed to obtain power from the power receiving unit C to operate these functions. There is.

Next, the operation of the present invention will be described with reference to FIGS.
This will be described with reference to FIGS. 4, 5, 6, and 7. FIG. 4 is a flowchart showing the operation of the central control unit 21 when the AC power supply of the terminal device 2 is switched, and FIG.
7 is a flowchart showing the operation of the central control unit 21 when the C power source is restored, FIG. 6 is a flowchart showing the operation of the line terminating device 1, and FIG. 7 is a transmission used when the line terminating device 1 determines the transmission power. This is a configuration example of a power decision control table, and this table is in the central control unit 11 of the line terminating device 1. First, the operation of the terminal device 2 will be described with reference to FIGS. 3, 4, and 5. Since the terminal device 2 now uses the data function and the additional service function in addition to the basic telephone function, the terminal device 2 operates with the power supplied by the limited power supply of the power receiving unit A and the power of the power receiving unit C based on the local power supply. At this point, if the local power supply is stopped at some point due to some cause, or if it is restored, the power reception monitoring unit 24 makes such a change in the power reception state of the power reception unit C27 the central control unit 2.
Notify 1. The operation of the central control unit 21 when the AC power is cut off will be described with reference to the flowchart of FIG. The central control unit 21 detects that the AC power is off (S ₁ ).
By switching from the AC power supply to the backup power supply (S ₂ ), the minimum control and monitoring functions such as the central control unit 21, the Q channel transmission processing unit 23, and the power reception monitoring unit 24 are operated. Secure. Receiving the monitoring unit 24 generates power consumption information (S _3), instructs to deliver feed start request signal to the Q channel relative to the Q-channel transmission processing unit 23 to the network unit 1 (S _4). As a result of power-up being performed from the line terminating device 1 that has received this power-supply start request signal, the power reception monitoring unit 24
There detecting the up reception power and (S _5), switches the power supply of the backup power supply line terminal detects a receiving up 1 (S _6). Central control unit 2 when AC power is restored
The operation No. 1 will be described with reference to the flowchart of FIG. When the central control unit 21 detects that the AC power source is ON (S ₁ ), it switches from the DSU power source to the AC power source (S ₂ ), then generates power consumption information (S ₃ ), and transmits the Q channel. The processing unit 23 is instructed to send the power supply stop request signal to the Q channel (S ₄ ). Upon receiving the power feed start request signal, the line terminating device 1 lowers the power feed, so that the power reception control unit detects that the received power is down (S ₅ ). If not down, power consumption information is generated. The central control unit 21, which has detected the change in the power receiving state of the local power feeding, inquires of the power receiving monitoring unit 24 about the power receiving state (disconnection / recovery) of the power receiving unit C27, and as a result, if the disconnection state is found, the power supply start request process is restored. If it is in the state, the power supply stop request process is performed. The power feed start request process instructs the Q channel transmission processing unit 23 to send a power feed start request signal based on the power consumption information. Q channel transmission processing unit 2
In accordance with an instruction from the central control unit 21, 3 multiplexes the power supply start request signal with the Q channel signal and sequentially transmits the signal. After that, the central control unit 21 monitors the power receiving state of the power receiving unit in response to the power feeding request through the power receiving monitoring unit 24, and if power up is detected, switches the power source for operating the additional service function to the power receiving unit. On the other hand, in the power supply stop request processing, the central control unit 21 instructs the Q channel transmission processing unit 23 to send out the power supply stop request signal based on the power consumption information. The Q channel transmission processing unit 23 follows the instruction of the central control unit 21,
The power supply stop request signal is multiplexed with the Q channel signal and sequentially transmitted. After that, the central control unit 21 switches the power source for operating the additional service function and the like to the power receiving unit C27.

Next, the operation of the line termination device 1 will be described with reference to FIGS. 2, 6 and 7. Line termination device 1
Normally performs limited power supply (0.42 W) by the power supply unit A15. Here, when the Q channel reception processing unit 13 receives a request signal for starting or stopping power supply from the terminal device 2 through the Q channel (S ₁ ), the Q channel reception processing unit 13 determines which terminal device 2 from which terminal device 2 Q
Whether or not it is a channel signal is detected, while sending out duplicated data from the same terminal device is eliminated (S ₂ ), the Q channel signal is notified to the central control unit 11. The central control unit 11 notified of the reception detection of the Q channel signal inquires the Q channel reception processing unit 13 about the meaning of the reception signal, and as a result, when it is a power feeding start request, calculates the amount of power to be transmitted from the prescribed information (S _3), the conversion Te delivery power determination control shown in FIG. 7 - of the feeding section a or the feeding unit B in accordance with the required power amount by using the table limiting the feed or Bruno - it makes decisions delivered power by appropriately selecting the combination of Mar feed (S _4),
The power supply unit A and / or the power supply unit B is controlled to the limited power supply and / or the normal power supply state based on the determined contents (S ₅ ). The details of the method for determining the transmission power using the conversion table for transmission power determination control in FIG. 7 will be described below. When the calculation result of the amount of power to be sent from the line terminating device 1 is type A: 0.42 W or less, only limited power feeding (0.42 W) by the power feeding A is performed, and type B: 0.4 to 1
In W, only the normal power supply (1 W) by the power supply A, and in Type C: 1 to 2.4 W, the limited power supply by the power supply A (0.42 W) and the limited power supply by the power supply B (2 W),
In the type D: 2.4 to 3 W, the normal power feeding (1 W) by the power feeding A and the limited power feeding (2 W) by the power feeding B are performed, and in the type E: 3 to 7.4 W, the limited power feeding (0.
42 W) and the normal power supply (7 W) by the power supply B. For the type F: 7.4 W or more, the normal power supply (1 W) by the power supply A and the normal power supply (7 W) by the power supply B are respectively performed. By the selection, a predetermined electric power more than requested is supplied. Although one embodiment of the present invention has been described above, such a power supply control method can be easily realized nowadays when devices inside the home are released from the DSU including a DSU (home line terminating device).

[0009]

As described above, according to the present invention, only when the local power supply to the terminal device is stopped, the power is temporarily supplied to the terminal device in association with the deactivation of the power supply. The backup power supply secures the minimum control and monitoring functions of the terminal device, and this function requests the power supply to the line terminating device, and the power supply request from this terminal device causes the power supply units A and / or Alternatively, since the limited power supply and / or the normal power supply of the power supply unit B are performed (instead of the limited power supply of the power supply unit A, the normal power supply by the power supply unit A or the limited power supply or the normal power supply by the power supply unit B) is performed. Even if the local power supply is stopped in the terminal device without increasing the power consumption of the line terminating device as much as the conventional example, not only the basic telephone function but also the data device And the provision of services of the supplementary service function and the like is possible. Therefore, there is an effect that the deterioration of the service of the terminal device is prevented when the local power supply is stopped.

[Brief description of drawings]

FIG. 1 is a schematic diagram illustrating a power supply system in ISDN.

FIG. 2 is a block diagram of a line terminal device according to an embodiment of the present invention.

FIG. 3 is a block diagram of a terminal device according to an embodiment of the present invention.

FIG. 4 is a flowchart showing the operation of the central control unit when the AC power supply is switched off in the terminal device in the embodiment of the present invention.

FIG. 5 is a flowchart showing the operation of the central control unit when the AC power supply of the terminal device is restored in one embodiment of the present invention.

FIG. 6 is a flowchart showing an operation of the line terminal device in the embodiment of the present invention.

FIG. 7 is a table for transmission power determination control used when the line termination device in one embodiment of the present invention determines transmission power.
It is a configuration example of a bull.

[Explanation of symbols]

1 Line terminator 2 terminal devices 11 Central control unit 12 line interface 13 Q channel reception processing unit 14 Power supply controller 15 Power supply unit A 16 Power supply section B 21 Central control unit 22 line interface 23 Q channel transmission processing unit 24 Power receiving monitor 25 Power receiving unit A 26 Power receiving unit B 27 Power receiving unit C 28 AC adapter 201 terminal device 202 terminal device 251 Power receiving unit A 252 Power receiving unit B 281 AC adapter 282 AC adapter

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04M 19/08

Claims (2)

(57) [Claims] 1. A first power supply means for selecting and outputting a normal power supply output or a limited power supply output to a terminal device by a phantom power supply system, and a plurality of supplies to the terminal device via a pair of power transmission lines. In an ISDN line terminating device provided with a second power supply means for selectively selecting and outputting electric power, a receiving process for detecting power supply request data supplied from the terminal device via a data line. And a control means for calculating the power value to be supplied based on the power consumption value in the power supply request data and controlling the selection state of the first power supply means and the second power supply means. A power supply control method for a line terminating device, characterized in that 2. A first power receiving means for inputting a normal power feeding output or a limited power feeding output by a phantom power feeding system from a line terminating device, and a power supply selected by a line terminating device via a pair of power transmission lines. In an ISDN terminal device provided with a second power receiving means for inputting, a third power receiving means for supplying power based on a commercial power source, and a temporary power supply to the terminal in association with deactivation of the commercial power source Of the backup power source and the commercial power source are detected to generate power supply request data, and an increase in the power supplied to the first power receiving means or the second power receiving means is detected to replace the backup power source. And a control means for supplying the output power of the first power receiving means or the second power receiving means to the terminal device.
SDN terminal device power supply control method.